摘要
目的建立具有详细解剖结构的人工寰齿关节置换后寰枢关节有限元模型。方法对人体正常新鲜寰枢椎尸体标本和人工寰齿关节进行薄层CT扫描，扫描数据导人Mimics软件进行寰枢椎椎骨模型和人工寰齿关节三维模型重建，然后将模型数据导人Freeform软件，以临床操作为参考，将人工寰齿关节模型装配于寰枢椎模型，再导人Ansys有限元软件构建人工寰枢关节几何模型，网格划分后添加相关韧带结构，最终建立人工寰齿关节置换后寰枢关节有限元模型，模型中关节面均定为有摩擦系数的表面滑动接触关节。固定C2椎体下缘，在寰椎侧块上关节面施加40N的垂直向下载荷模拟头颅重力，并分别施加不同方向的1．53N／m扭矩载荷，计算求解此模型在前屈、后伸、侧屈及旋转状态下的三维活动度，并与尸体标本实验测得实验数据对比进行验证。结果建立了具有详细解剖结构的人工寰齿关节置换后寰枢关节有限元模型，整个模型有103053个单元和26324个节点，在前屈、后伸、右侧屈及右旋转状态下，人工寰齿关节模型的活动度分别为1．6°、5．1°、4．6°和22．0°。结论初步建立人工寰齿关节置换后寰枢关节有限元模型。
Objective To develop and validate an anatomic detailed finite element model of atlan- to-axial joint following artificial atlanto-odontoid joint arthroplasty. Methods The normal fresh human specimens of atlas and axial and artificial atlanto-odontoid joint were subjected to CT scan. Three-dimen- sional model was established by Mimics software. According to clinical practice, dealing with atlas and axi- al and assembling artificial atlanto-odontoid joint by Freeform. After constructing the geometric model and meshing the solid model using tetrahedral solid elements, adding the relevant ligament structure, the meshed model was acquired and finished by Ansys at last. The ligaments were modeled with tension-only spring ele- ments with bilinear modulus of elasticity data according to neutral and elastic zones. The ligaments of model includes ： atlantoaxial joint capsule and ligaments, facet joint capsular ligament, interspinous ligament, su- praspinous ligament. Sliding contact definitions with friction were used for all the facet joints. In the analy- sis, the weight of the skull was simulated by applying vertical load of 40 N on the fixed handle, and the infe- rior surface of the C2 venebral body was fully constrained but the upper part of the atlas without any con- straints. Pure moment loading of 1.53 N. m was applied to the fixed handle to simulate various movements of the atlanto-axial joint under flexion, extension, lateral bending and axial rotation configurations. The the range of motion （ROM） of model under different direction were evaluated biomechanically. To validate the finite element model in term of ROM compared against the experimental data by Yong Hu at al. Results The model consists of 26324 nodes and 103053 elements, In the conditions of flexion,extension,righe flex- ion and right rotatio, the ROM of the artificial atlanto-odontoid joint are 1.6 °, 5.1°,4. 6°and 22.0 °, that is correlated well with the results by Yong Hu at al. Conclusion The anatomic detailed finite element model realist
出处
《中华实验外科杂志》
CAS
CSCD
北大核心
2013年第7期1422-1424,共3页
Chinese Journal of Experimental Surgery
基金
浙江省卫生厅医药卫生科学研究基金资助项目（2009A189）
宁波市自然科学基金资助项目（2010A610059）
关键词
生物力学
寰齿关节
寰枢关节
关节成形术
Biomechanics
Atlanto-odontoid joint
Atlanto-axial joint
Arthroplasty
